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正常大鼠小肠的消化间期综合肌电（ＭＭＣ）由四个时相组成：１时相指重迭在快波上的慢波数在０～５％（发生率），Ⅱ、Ⅳ时相指重达快波的慢波数在５．１～９５％，Ⅲ时相指重迭快波的慢波数在９５．１～１００％。四个时相持续时间分别为３．０～４．０、３．０～６．０、２．５～１．０、０．５～１．０ｍｉｎ，ＭＭＣ周期为１０～１５ｍｉｎ。脾虚大鼠小肠ＭＭＣ的Ⅰ、Ⅲ、Ⅳ时相持续时间缩短或消失，Ⅱ时相及周期明显延长，表明小肠运动功能发生紊乱。加味四君子汤能使脾虚大鼠的ＭＭＣ各时相及周期恢复正常，具有调节小肠运动功能紊乱的作用。
The complex intermuscular electromyography (MMC) of the small intestine of the normal rat consists of four phases: the slow wave number of the phase finger that overlaps the fast wave is 0 to 5% (incidence), and the phase II and IV phases refer to The number of slow waves that weighed fast waves is 5.1 to 95%. In phase III, the number of slow waves that overlap fast waves is 95.1 to 100%. The duration of the four phases was 3.0-4.0, 3.0-6.0, 2.5-1.0, and 0.5-1.0 min, respectively, and the MMC cycle was 10-15 min. The duration of I, III, and IV in the small intestine MMC of spleen deficiency rats was shortened or disappeared, and phase II and cycle were significantly prolonged, indicating that the intestinal function was disordered. Modified Sijunzi Decoction can restore the normal phase and cycle of MMC in spleen-deficient rats, and it can regulate the dysfunction of small intestine.